John 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
God was never a murderer. The Bible talks about the Devil being a murderer even from the beginning according to John 8:44.
It is not right to call God a murderer. God can't murder someone because He's the owner of life and the giver of life. God has the right to give life and to take it.
St. John 10:17-18 Therefore doth my Father love me, because I lay down my life, that I might take it again. No man taketh it from me, but I lay it down of myself. I have power to lay it down, and I have power to take it again. This commandment have I received of my Father.
There are several ways God can take life. It can be an infection, earthquake, tsunami and other natural disasters. How can you call the owner of life a murderer? Since He owns our lives, he has the right to take them.
Hebrews 9:27 And as it is appointed unto men once to die, but after this the judgment:
We are going to die one day because God has appointed a day for our death and after death judgement. It was Satan that was called the murder in the Bible according to John 8:44. Satan is a manslayer because he didn't have the legal right to take life.
Ecclesiastes 8:8 There is no man that hath power over the spirit to retain the spirit; neither hath he power in the day of death: and there is no discharge in that war; neither shall wickedness deliver those that are given to it.
Job 12:10 In whose hand is the soul of every living thing, and the breath of all mankind.
Our breath is in God's hand.